Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels

The application of aluminum (Al)-based nanostructures for visible-range plasmonics, especially for surface-enhanced Raman scattering (SERS), currently suffers from inconsistent local electromagnetic field distributions and/or inhomogeneous distribution of probe molecules. Herein, we lithographically...

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Main Authors: Lay, Chee Leng, Koh, Charlynn Sher Lin, Wang, Jing, Lee, Yih Hong, Jiang, Ruibin, Yang, Yijie, Yang, Zhe, Phang, In Yee, Ling, Xing Yi
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/90091
http://hdl.handle.net/10220/48391
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-900912023-02-28T19:36:41Z Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels Lay, Chee Leng Koh, Charlynn Sher Lin Wang, Jing Lee, Yih Hong Jiang, Ruibin Yang, Yijie Yang, Zhe Phang, In Yee Ling, Xing Yi School of Physical and Mathematical Sciences Security Labels SERS Active Aluminum Structures DRNTU::Science::Chemistry The application of aluminum (Al)-based nanostructures for visible-range plasmonics, especially for surface-enhanced Raman scattering (SERS), currently suffers from inconsistent local electromagnetic field distributions and/or inhomogeneous distribution of probe molecules. Herein, we lithographically fabricate structurally uniform Al nanostructures which enable homogeneous adsorption of various probe molecules. Individual Al nanostructures exhibit strong local electromagnetic field enhancements, in turn leading to intense SERS activity. The average SERS enhancement factor (EF) for individual nanostructures exceeds 104 for non-resonant probe molecules in the visible spectrum. These Al nanostructures also retain more than 70% of their original SERS intensities after one-month storage, displaying superb stability under ambient conditions. We further achieve tunable polarization-dependent SERS responses using anisotropic Al nanostructures, facilitating the design of sophisticated SERS-based security labels. Our micron-sized security label comprises two-tier security features, including a machine-readable hybrid quick-response (QR) code overlaid with a set of ciphertexts. Our work demonstrates the versatility of Al-based structures in low-cost modern chemical nano-analytics and forgery protection. ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Accepted version 2019-05-27T09:17:25Z 2019-12-06T17:40:27Z 2019-05-27T09:17:25Z 2019-12-06T17:40:27Z 2017 Journal Article Lay, C. L., Koh, C. S. L., Wang, J., Lee, Y. H., Jiang, R., Yang, Y., . . . Ling, X. Y. (2018). Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels. Nanoscale, 10(2), 575-581. doi:10.1039/C7NR07793A 2040-3364 https://hdl.handle.net/10356/90091 http://hdl.handle.net/10220/48391 10.1039/C7NR07793A en Nanoscale © 2018 The Royal Society of Chemistry. All rights reserved. This paper was published in Nanoscale and is made available with permission of The Royal Society of Chemistry. 22 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Security Labels
SERS Active Aluminum Structures
DRNTU::Science::Chemistry
spellingShingle Security Labels
SERS Active Aluminum Structures
DRNTU::Science::Chemistry
Lay, Chee Leng
Koh, Charlynn Sher Lin
Wang, Jing
Lee, Yih Hong
Jiang, Ruibin
Yang, Yijie
Yang, Zhe
Phang, In Yee
Ling, Xing Yi
Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
description The application of aluminum (Al)-based nanostructures for visible-range plasmonics, especially for surface-enhanced Raman scattering (SERS), currently suffers from inconsistent local electromagnetic field distributions and/or inhomogeneous distribution of probe molecules. Herein, we lithographically fabricate structurally uniform Al nanostructures which enable homogeneous adsorption of various probe molecules. Individual Al nanostructures exhibit strong local electromagnetic field enhancements, in turn leading to intense SERS activity. The average SERS enhancement factor (EF) for individual nanostructures exceeds 104 for non-resonant probe molecules in the visible spectrum. These Al nanostructures also retain more than 70% of their original SERS intensities after one-month storage, displaying superb stability under ambient conditions. We further achieve tunable polarization-dependent SERS responses using anisotropic Al nanostructures, facilitating the design of sophisticated SERS-based security labels. Our micron-sized security label comprises two-tier security features, including a machine-readable hybrid quick-response (QR) code overlaid with a set of ciphertexts. Our work demonstrates the versatility of Al-based structures in low-cost modern chemical nano-analytics and forgery protection.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Lay, Chee Leng
Koh, Charlynn Sher Lin
Wang, Jing
Lee, Yih Hong
Jiang, Ruibin
Yang, Yijie
Yang, Zhe
Phang, In Yee
Ling, Xing Yi
format Article
author Lay, Chee Leng
Koh, Charlynn Sher Lin
Wang, Jing
Lee, Yih Hong
Jiang, Ruibin
Yang, Yijie
Yang, Zhe
Phang, In Yee
Ling, Xing Yi
author_sort Lay, Chee Leng
title Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
title_short Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
title_full Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
title_fullStr Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
title_full_unstemmed Aluminum nanostructures with strong visible-range SERS activity for versatile micropatterning of molecular security labels
title_sort aluminum nanostructures with strong visible-range sers activity for versatile micropatterning of molecular security labels
publishDate 2019
url https://hdl.handle.net/10356/90091
http://hdl.handle.net/10220/48391
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